[Bug target/70381] On powerpc, -mfloat128 is on by default for all VSX systems

["meissner at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70381

--- Comment #7 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Mon Apr 11 19:45:35 2016
New Revision: 234884

URL: https://gcc.gnu.org/viewcvs?rev=234884&root=gcc&view=rev
Log:
[gcc]
2016-04-11  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/70381
        * config/rs6000/rs6000.c (rs6000_opt_masks): Disable using the
        target attribute and pragma from changing the -mfloat128
        and -mfloat128-hardware options.

        * doc/extend.texi (Additional Floating Types): Document PowerPC
        __float128 restrictions.

[libgcc]
2016-04-11  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/70381
        * configure.ac (powerpc*-*-linux*): Rework tests to build
        __float128 emulation routines to not depend on using #pragma GCC
        target to enable -mfloat128.
        * configure: Regnerate.

[gcc/testsuite]
2016-04-11  Michael Meissner  <meissner@linux.vnet.ibm.com>

        PR target/70381
        * gcc.target/powerpc/float128-1.c: New tests to make sure the
        __float128 emulator is built and runs.
        * gcc.target/powerpc/float128-1.c: Likewise.

        * lib/target-supports.exp (check_ppc_float128_sw_available):
        Rework tests for __float128 software and hardware
        availability. Fix exit condition to return 0 on success.


Added:
    trunk/gcc/testsuite/gcc.target/powerpc/float128-1.c
    trunk/gcc/testsuite/gcc.target/powerpc/float128-2.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/rs6000/rs6000.c
    trunk/gcc/doc/extend.texi
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/lib/target-supports.exp
    trunk/libgcc/ChangeLog
    trunk/libgcc/configure
    trunk/libgcc/configure.ac